When i try to build ihmcrosjavaadapter by running command `roslaunch ihmcvalkyrieros valkyriewarmupgradlecache.launch`, i'm getting error:

BUILD FAILED

Total time: 58 mins 20.942 secs
================================================================================REQUIRED process [IHMCValkyrieROSAPI-2] has died!
process has died [pid 2971, exit code 1, cmd /opt/ros/indigo/share/ihmc_ros_java_adapter/gradlew warmUp -x runJavaDelegate -PuseLocal=false -Pyaml=/opt/ros/indigo/share/ihmc_valkyrie_ros/configurations/api.yaml __name:=IHMCValkyrieROSAPI __log:=/home/robot/.ros/log/3e8dec5c-7005-11e7-bb1b-6c88146466c8/IHMCValkyrieROSAPI-2.log].
log file: /home/robot/.ros/log/3e8dec5c-7005-11e7-bb1b-6c88146466c8/IHMCValkyrieROSAPI-2*.log
Initiating shutdown!

I was following this tutorial. Without this step. If i try to launch the valkyrene robot in gazebo, the gazebo window shuts down in short time showing this error message:

[Err] [Model.cc:1008] Sensors failed to initialize when loading model[valkyrie] via the factory mechanism.Plugins for the model will not be loaded.